Hi Oleg,
Thank you for your interest in Syncfusion Products.
This can be achieved by cloning the Paragraph and insert the cloned paragraph at the end of the paragraph.
Here is the code snippets:
//A new document is created.
WordDocument document = new WordDocument();
//Add a new section to the document.
IWSection section = document.AddSection();
//Adding a new paragraph to the section.
IWParagraph paragraph = section.AddParagraph();
paragraph.AppendText("my text {placeholder}my text {placeholder}");
// section.AddParagraph().AppendText("my text {placeholder}");
//Clone the particular paragraph:
Entity par = section.Paragraphs[0].Clone();
//Insert the paragraph0
section.Paragraphs.Insert(1, par as IWParagraph);
Please refer the sample in the following link to illustrate this:
http://websamples.syncfusion.com/samples/DocIO.Windows/70193/main.htmPlease try this and let me know if you have any questions.
Regards,
Jisha